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#
# __COPYRIGHT__
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
"""
This configuration is for timing how we evaluate long chains of
dependencies, specifically when -j is used.
We set up a chain of 100 targets that get built from a Python function
action with no source files (equivalent to "echo junk > $TARGET").
Each target explicitly depends on the next target in turn, so the
Taskmaster will do a deep walk of the dependency graph.
This test case was contributed by Kevin Massey. Prior to revision 1468,
we had a serious O(N^2) problem in the Taskmaster when handling long
dependency chains like this. That was fixed by adding reference counts
to the Taskmaster so it could be smarter about not re-evaluating Nodes.
"""
target_cnt = 100
env = Environment()
def write_file( env, target, source ):
path_target = env.File( target ).path
outfile = open( path_target, 'w' )
outfile.write( 'junk' )
outfile.close()
list = []
for i in range( target_cnt ):
target = 'target_%03d' % i
env.Command( target, [], write_file )
env.Depends( target, list )
list.append( target )
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